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| Preparation and Spectral Properties of White Light Emitting LED Based on Layered Remote Phosphor Film |
| ZHUO Ning-ze1, 2, 3, ZHANG Na1, 2, CHEN Yong-hao4, JIANG Peng4, CHENG Shao-wen5, ZHU Yue-hua1, 2, WANG Hai-bo2* |
1. Research Institute of Electric Light Source Material Science of Light Industry, Nanjing 210015, China
2. Research Institute of Electric Light Source Materials, Nanjing Tech University, Nanjing 210015, China
3. School of Electronic Science and Engineering, Nanjing University, Nanjing 210093, China
4. School of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, China
5. School of Energy Science and Engineering, Nanjing Tech University, Nanjing 211800, China |
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Abstract Based on layered phosphor and remote phosphor packaging technology, double layer remote phosphor film were prepared by hot pressing method, and the films then were packaged into white LED. Fluorescence spectrophotometer and the visible spectrum analysis system were used to study the influence on the white LED spectral properties of the layer order of green and red remote phosphor films and emission wavelength. Results showed that the luminescent efficiency of radiation of blue-green-red type package structure compared to the blue-red-green type package structure was improved by 31.69%, and the color fidelity and color gamut index increased with the increasing of red remote phosphor film wavelength. With emission wavelength 660nm, the color fidelity and color gamut index of prepared white LED reached the highest value 91 and 104 respectively. In contrast, luminescent efficiency of radiation was inversely proportional to the wavelength; color fidelity decreased with the increasing of green remote phosphor film wavelength, and color gamut index raised first, then decreased, when emission wavelength was 530 nm, with the luminescent efficiency of radiation of prepared white LED reaching the highest value 300.7 lm·W-1. Finally, the related conclusions of present study had a certain reference value for the actual application.
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Received: 2017-07-22
Accepted: 2017-12-16
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Corresponding Authors:
WANG Hai-bo
E-mail: wanghaibo88@163.com
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